Biodegradable beta-tricalcium phosphate (β-TCP) particle reinforced magnesium metal matrix composites (Mg-MMC) have attracted increasing interest for application as implant materials. This investigation was conducted to study the effect of cooling rate on the microstructure and corrosion behavior of a biodegradable β-TCP/Mg-Zn-Ca composite. The composite was fabricated under a series of cooling rates using a wedge-shaped casting mold. The microstructure of the composite was examined by optical and scanning electron microscopy, and the corrosion behavior was investigated using an electrochemical workstation and immersion tests in a simulated body fluid (SBF). Faster cooling rates were shown to refine the secondary phase and grain size, and produce a more homogenous microstructure. The refined microstructure resulted in a more uniform distribution of β-TCP particles, which is believed to be beneficial in the formation of a stable and compact corrosion product layer, leading to improved corrosion resistance for the composite.

可生物降解的β-磷酸三钙（β-TCP）颗粒增强的镁金属基复合材料（Mg-MMC）越来越多地被用作植入材料。进行这项研究以研究冷却速率对可生物降解的β-TCP/ Mg-Zn-Ca复合材料的微观结构和腐蚀行为的影响。使用楔形铸造模具在一系列冷却速率下制造复合材料。通过光学和扫描电子显微镜检查复合材料的微观结构，并使用电化学工作站和在模拟体液（SBF）中的浸没测试研究腐蚀行为。结果表明，更快的冷却速度可细化第二相和晶粒尺寸，并产生更均匀的微观结构。